Rock size fragments reduction allow including their effect on water retention properties determined with a dew point potentiometer

Gubiani, Paulo Ivonir; Pereira, Caroline Andrade; Cauduro, Jussara Santoli; Campbell, Colin S.; Rivera, Leonardo; Pigatto, Cassiano Salin; França, Jéssica Silveira

doi:10.36783/18069657rbcs20200182

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…The water retention in CF S at suctions greater than 100 m was determined with the WP4C device mentioned above, as proposed by Gubianiet al (2021b). The CFs were fractured to sizes between 2 and 4 mm, moistened and kept hermetically sealed for 24 h to allow water redistribution (Campbell et al, 2007) and then the water‐potential relation in the range −100 to −1000 m was determined as described in Gubiani et al (2012), converting mass to volume base by multiplying by ρ b /ρ a .…”

Section: Methodsmentioning

confidence: 99%

“…The WP4C measures water potential in the range from 0 to À10 MPa with an accuracy of 0.1 MPa and in the range from 10 to 300 MPa with an accuracy of 1%. Measurements were performed as proposed by Gubiani et al (2021b) for coarse soils. To do so, all dried soil blocks were gently disturbed to avoid the breakdown of coarse material.…”

Section: Water Retention In Soil Blocksmentioning

confidence: 99%

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Particle arrangement and internal porosity of coarse fragments affect water retention in stony soils

Pereira

Mulazzani

Lier

et al. 2023

European J Soil Science

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Information about water retention in stony soils lags behind due to methodological difficulties. We applied a new strategy to measure the water retention in soils with coarse fragments (CFs) and to get insights into the effect of CFs porosity on water retention. Water retention at zero, 10, and 150 m suction, bulk density, and the mass fraction of six particle size classes were measured in undisturbed blocks from soils with variable CFs contents, originating from three parent materials. The results showed that some soils contain porous CFs (2-250 mm) with a water holding capacity as high as the fine fraction (<2 mm). The water held in the suction range of 1-150 m in a soil with porous CFs was twice as high as in soils with non-porous CFs. Multilinear regressions revealed that both the water retention capacity at 1 m suction and in the range 1-150 m were more dependent on bulk density than on the fraction of CFs and fine particles. In the soil with porous CFs, there was no correlation between their fraction and soil water retention. These results show that the bulk water retention capacity of soils with CFs is underestimated when not considering the internal porosity of the CFs. A better understanding of the effect of the porosity of CFs on bulk soil porosity and water retention is important to propose suitable pedotransfer functions and refine physically-based hydraulic functions for stony soils.

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Section: Methodsmentioning

confidence: 99%

Section: Water Retention In Soil Blocksmentioning

confidence: 99%